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coefficients of power series with Laurent series coefficients

I want to be able to pick out the different monomials in a power series ring with coefficient ring Laurent series in another variable (or more). For example:

Q. = LaurentSeriesRing(QQ) S.<x> = LaurentSeriesRing(Q) SS. ~~= PowerSeriesRing(S)~~

U = 1 + 2X^3s^4 + 5q^6X^7*s^8

What's the best way to extract the different monomials together with their coefficients?

coefficients of power series with Laurent series coefficients

I want to be able to pick out the different monomials in a power series ring with coefficient ring Laurent series in another variable (or more). For example:

Q.
Q.<q> = LaurentSeriesRing(QQ) S.<x> S.<X> = LaurentSeriesRing(Q) SS. SS.<s> = PowerSeriesRing(S) PowerSeriesRing(S) U = 1 + 2X^3s^4 2*X^3*s^4 + 5q^6X^7*s^85*q^6*X^7*s^8

~~What's the best way to extract the different monomials together with their coefficients?~~